Pick Up Where We Left Off

"When we're 30, I want you to marry me. Promise?"
"Promise."

"If we're still single in 15 years, you have to keep your promise."
"Fine."
"What're you supposed to say~?"
"Ugh..I promise."

I didn't think that those 15 years would fly by. Now he's back in my life and I have to keep my promise. Who knew I'd end up marrying him.

This is a short story that I'm submitting to a writing competition on Google+.
Prompt: Two teen lovers meet after 15 years of separation